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Suppose that G has an end point x0 and T is a self-path map.
Note that T is a self-path map which has no fixed point.
Then G has a start set if and only if each self-path map on G has a fixed set.
Then G has an end point if and only if each self-path map on G has a fixed point.
We say that T is a self-path map whenever x∈ [ T x] G for all x∈G.
Therefore, from the definition of self-path map, we have (Din[T(D ]_{G}), which implies that (Din G^{prime}).
Now assume that G is a directed graph and each self-path map on G has a fixed point but has no end point.
Since x∈ [ T x] for all x∈G′, T x∈ [ T2x] G and so T is a self-path map on G′.
Then it is easy to see that T is a self-path map but G has no fixed set and no start set either.
Our next example shows that indeed if a directed graph has no start set, then a self-path map may be defined which has no fixed set.
Further, the notion of a self-path set valued map is defined and its relation with the start set is established.
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